TY  - JOUR
AU  - Xu, H. Y.
AU  - Jachmich, S.
AU  - Weynants, R. R.
AU  - Huber, A.
AU  - Unterberg, B.
AU  - Samm, U.
TI  - Investigation of self-organized critically behavior of edge plasma transport in Torus experiment of technology oriented research
JO  - Physics of plasmas
VL  - 11
SN  - 1070-664X
CY  - [S.l.]
PB  - American Institute of Physics
M1  - PreJuSER-41092
SP  - 5413 - 5422
PY  - 2004
N1  - Record converted from VDB: 12.11.2012
AB  - The self-organized criticality (SOC) behavior of the edge plasma transport has been studied using fluctuation data measured in the plasma edge and the scrape-off layer of Torus experiment of technology oriented research tokamak [H. Soltwisch , Plasma Phys. Controlled Fusion 26, 23 (1984)] before and during the edge biasing experiments. In the "nonshear" discharge phase before biasing, the fluctuation data clearly show some of the characteristics associated with SOC, including similar frequency spectra to those obtained in "sandpile" transport and other SOC systems, slowly decaying long tails in the autocorrelation function, values of Hurst parameters larger than 0.5 at all the detected radial locations, and a radial propagation of avalanchelike events in the edge plasma area. During the edge biasing phase, with the generation of an edge radial electric field E-r and thus of E(r)xB flow shear, contrary to theoretical expectation, the Hurst parameters are substantially enhanced in the negative flow shear region and in the scrape-off layer as well. Concomitantly, it is found that the local turbulence is well decorrelated by the E(r)xB velocity shear, consistent with theoretical predictions. (C) 2004 American Institute of Physics.
KW  - J (WoSType)
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000225450200008
DO  - DOI:10.1063/1.1810160
UR  - https://juser.fz-juelich.de/record/41092
ER  -